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PS Vita developer dots_tb has released something for the PS4, his application is called scever_patch and is used to patch PS4 .elf files from firmware 5.50 to run on firmware 5.05.

This is more for other developers such as @silicaAndPina, this will not let you run PS4 games that require high firmware's on firmware 5.05, if in the future games from higher firmwares get decrypted, then this tool might possibly work with getting them to run of firmware 5.05.